Map of the St. Louis area showing the position and track of the aircraft described in the post.

🇺🇸 N37318 - Boeing 737MAX 8 - United Airlines UAL1318/UA1318, Baltimore/Washington Thurgood Marshall (BWI) to Denver (DEN) - 4.9 mi away @ 37875 ft, heading W at 494 mph. Spotted 5x before! [09:06:59 AM CDT] #A4418C #N37318 #B38M #UNITED #UAL1318 #UA1318 #ADSB #ADSBbot